<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<script src="js/observer.js"></script>
<script src="js/watcher.js"></script>
<script src="js/mvvm.js"></script>
<script>
    var mvvm = new MVVM({
        data: {
            person: {name: 'sunchp', age: 18}
        }
    });
    mvvm.person.name = "xhh";
</script>
</body>
</html>